By 256 steps, do you mean you want an 8-bit converter? Most of our converters have higher resolution that that, especially the ones that will sample fast enough to reach 1 GHz output tone. To reach such an output, I suggest you look at the AD9119, an 11-bit, 2.85 GSPS RF DAC. That will directly synthesize 1 GHz. www.analog.com/ad9119
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